Title :
High current density self-field effects and low-frequency noise in NiFe/Ag GMR multilayers
Author :
Kirschenbaum, L.S. ; Rogers, C.T. ; Beale, P.D. ; Russek, S.E. ; Sanders, S.C.
Author_Institution :
Condensed Matter Lab., Colorado Univ., Boulder, CO, USA
fDate :
9/1/1996 12:00:00 AM
Abstract :
High current densities (106-107 A/cm2 ) produce magnetic fields which can induce antiparallel magnetic alignment in large (16 μm and 8 μm) NiFe/Ag thin film multilayer devices. We induce GMR in unannealed devices which normally do not display GMR. We find multiple peaks in the magnetoresistance curves of annealed and unannealed devices. Analysis of the positions and shapes of these magnetoresistance peaks provides a new set of tools for determining the micromagnetic structure of the multilayers. Our magneto-optical Kerr effect data and low frequency noise data correlate with the magnetoresistance peaks and may yield further information about layer-layer interactions and domain structure
Keywords :
Kerr magneto-optical effect; current density; ferromagnetic materials; giant magnetoresistance; iron alloys; magnetic domains; magnetic multilayers; magnetic noise; magnetic structure; nickel alloys; silver; 16 mum; 8 mum; NiFe-Ag; NiFe/Ag GMR multilayers; domain structure; high current density self-field effects; induce antiparallel magnetic alignment; layer-layer interactions; low-frequency noise; magneto-optical Kerr effect; magnetoresistance curves; micromagnetic structure; multiple peaks; Annealing; Current density; Displays; Giant magnetoresistance; Low-frequency noise; Magnetic devices; Magnetic fields; Magnetic films; Magnetic multilayers; Thin film devices;
Journal_Title :
Magnetics, IEEE Transactions on
